Half-Range Fourier Series

Problem: According to all the examples I have gone through, they all have a limit when asking for the half-range. However, my teacher, in the question posted above, has not specified any limits. Is this a typing error? If not, can you please nudge me in the right direction.

2. Relevant equations

3. The attempt at a solution

None yet. I'm under the impression that question may have been typed wrong.